CONTROL VALVE Russian patent published in 2018 - IPC F16K1/12 F16K1/42 

FIELD: oil and gas industry.

SUBSTANCE: control valve comprises a body 1 with a pin 2, a fly gate 3 in the form of a movable sleeve with a power screw thread 4 on the outer surface and a groove 5 interacting with the pin 2, a seat 6 and a worm fly gate drive including a worm 7 located in the body 1 and a worm wheel 8 with a power screw thread on the inner surface interacting with the thread 4 of the moveable fly gate 3, a surface 9 of the seat 6 contacting the fly gate 3 is flat and its opposite surface 10 is spherical and concave and is provided with an axial bore 11. The supporting surface of the body 1 interacting with the spherical convex surface 10 of the seat 6 is spherical and concave 12 and is equipped with a cutter 13, on the axis of which there is a seat 6 and an elastic sleeve 14 in the axial bore 11 of the seat 6. The length of the elastic sleeve 14 is greater than the depth of the axial bore 11.

EFFECT: thanks to the installation of a seat with a flat sealing surface in a body with a cutter on a spherical bearing with an elastic sleeve and the possibility of the seat self-adjusting over the sealing surface of the fly gate, a more tight seal of the fly gate with the seat is ensured, and the required axial force affecting the fly gate to perform a tightness is reduced.

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